Gas-analyzing apparatus



Puenied Mar. `e, 192s. i 1,661,627 UNITED STATES PATENT OFFICE.

oLor nonne, or New Yoan, N. Y., AssieNoR To svENsxA .exfrinnonaen'r mono, or

STOCKHOLM, SWEDEN.

GAS-ANALYZING APPARATUS.

Application led August 19, 1926, Serial No. 130,290, and in Germany August28, 1925.

This invention relates to an apparatus for 10, 'line 8 leads to the gas pump which will analyzing gas mixtures, and particularly to be hereinafter described, and line 9 leads to a that type of gas analysis in which the gas cylinder 11 in which operates a piston 12 for mixture to be analyzed is led through an Shifting switch 13 so that the gas mixture 5 absorbing medium by which one of the gases pumped through tube 111 in a manner to be 60 of the mixture is absorbed, the remainder of described will be alternately led directly into the mixture being collected and measured. the absorbing vessel 15, as when the switches In'oider to insure correctness of the result in t-he positions shown in Fig. 1, and thenled the absorbing liquid should be renewed, and through the oxidizing furnace 16 into the 10 one object of the present invention is to re* absorbing vessel 15 when the position of the 85 new the absorbing liquid. This result is switch is reversed. This switching device achieved by using the absorbing liquid to forms no part of the present invention and oscillate the pumpin liquid, and thereafter will not be described in more detail in this conducting the absor ing liquid into the abapplication. I v

l5 sorbiiig and measuring vessel. This method The gas pump comprises an inner bell jar 70 provides a. considerable simplification over 17 and an outer bell jar 18, both extending older methods according to which separate nearly to the bottom of an outer receptacle liquids were used for pumping and absorb 19. A vertical tube 20 which extends out ing respective] v q through the top of inner bell jar 17 termi- :0 A further advantage of the present methnates at its lower end within a cup 21 into 75 od of utilizing the sameliquid for pumping the lower end of which leads a siphon tube and absorbingis that it tends to maintain 22. The receptacle 19 is filled with mercury an even temperature in the apparatus. A or other suitable medium to such a height large supply of absorbing liquid can be kept as to cover siphon tube 22 when the mercury 5 iiia tank outside the apparatus, and the or other medium is in position of rest." 80 same supply can be used for a number of The operation of the gas pump is as different apparatuses. follows:

When mercury is used as the liquid which The pump 1 forces absorbing liquid from is oscillated by the pumping liquid all the -reservoir 4 up through pipe 8, thereby o parts with which it comes in' 'contact must creating a pressure within the inner bell jar 85- vbe made of iron, since this is'the only metal 17, which forces the mercury down in said which will continuously withstand the eect inner bell im', and Causes it t0 rise Outside of mercury. It is important that these parts of both bel jars in lthe spaces 23 and 24, should remain as nearly as possiblel free of and also in tube 25 throiggh which gas mixrust in order to prevent a pollution of the ture is to be drawn in, and in tube 26 which 90 mercury and consequent interference with its acts as avalve in a manner to be later deoperation.v It is therefore desirable to use scribed. The pressure also forces the mera pumping li uid which `will not rust iron, vOury down in cup 21 and up through tube and the potas -lye which is ordinarily use'd 20. The pressure continues to rise causing as the absorbingy liquid lis particularly good -mercury to flow out of the top of tube 20 95 in this respect. into theY space 23. When the bottom of tube `The accompanying drawing shows dia- 20 is uncovered, and all the mercury isforced grammatically two examples of apparatus out of the tube the absorbing liquid can pass whichmay be used in ractisin the present freely up through tube A.20.and the pressure invention. Similar .re erence c aracters are 1n inner bell jar 17 immediately. drops, per- 10o used to desi ate t-lieparts ofthe apparatus mitting the mercury in spaces 23 and 24, which `are t esame in both embodiments. and tubes 25 vand V26 to drop and flow back In Fig. 1 is shown a. pump 1 continuously into the inner bell jar. driven b an electro-motor 2. The pump is During the rising of the mercury 1n space imme in the absorbing liquid .3o-contained 24 the gas mixture in this space is forced out. 105 V iiireservoir 4, and umps the absorbing liqthrong tube 27 into mercury valve .28, uid up* through tu 5. A throttle valve which as can be seen from Fig. 1, consists 6 .is provided A1n tube 5, and above this the of a bell )ar 29 within a receptacle 30,` the tube is divided into three separate lines 7, tube '27 extending down into the mercury 8, 11u19, leads to n. pressure gage within bell Jar-29, and the outlet tube 14 110 leading off from the top of said bell jar. lVhen gas is forced through tube 27 it forces the mercury out of bell jar 29 so that the bottom of tube 27 is uncovered and the gas can escape through tube 14 leading to switch 13, thence to the absorbing vessel. When the mercury iii space 24 falls the mercury iii the valve immediately seals the end of tube 27, and a vacuum is created in space 24. 'Ilie vacuum increases until the lower end of tube 25 is uncovered when new gas mixture moves into space 24 to fill the vacuum. This new gas is then pumped out through tube 27 in the manner previously described.

lVhen the mercury rises in the inner bell jar 17 far enough it flows through siplion tube 22 and seals the end of tube 20 so that the pressure again begins to build up.

The absorbing liquid which flows out through tube 20 rises in space 23 and flows over through tube 32 into the absorbing vessel 15. The absorbing vessel consists of a receptacle 33 having a centrally located 'flange 34, which may be cylindrical or any other suitable shape. Over the central flange is placed bell jar 35 which conforms loosely to the outer surface of the flange so as to be guided thereby with little friction` The bell jar 35 is preferably connected by suitable means 36 toa recording instrument not shown.

The receptacle 33 is maintained full by the new absorbing liquid flowing in through tube 32, an open connection 37 being provided in the tube so that the level in receptacle 33 will not be affected by variations in pressure in the gas pump. The liquid overflowing from receptacle 33 is caught in a cup 38 and returned through tube 39 to reservoir 4.

The gas mixture pumped into the absorbing vessel through pipe 14 rises through the absorbing liquid within flange 34, the gas which is to be absorbed remaining in the absorbing liquid, and the remaining gas being caught under bell liar 35. Said bell jar rises in accordance with the volume of the unabsorbed gas, and the extent of its rising is recorded by the recording instrument. The gas whose volume has been recorded escapes rom bell jar 35 through tube 40, Whose end extends into tube 2G, and is alternately sealed and opened at the proper instant by the rising and falling mercury.

It will be seen that the new absorbing mixture is introduced into the absorbing vessel within the flange 34, so that the incoming gas mixture continually meets fresh absorbmg liquid. The used absorbing liquid flows out between Harige 34 and bell jar 35 so that mixing of new and old absorbing liquid is minimized.

The only essential dilerence between the apparatus of Fig. 2 and that of Fig. l is in the absorbin and measuring apparatus. In Fig. 2 the asorbing vessel is separate from the measuring vessel. The switch 13 is in direct communication with tube 27, mercury valve 28 being located on the far side of the switch. The gas mixture passes from tube 14 into the absorbing vessel 33 inside of the enlarged tube 34 corres ending to flange 34 of Fig. 1. The unabsor ed gas rises in tube 34 and collects under bell jar 35. The lower end of bell jar 35 is sealed by absorbing liquid supplied to receptacle 41 by tube 32. The excess absorbing liquid in receptacle 41 overflows into tube 34 and passes down to absorbing vessel 33. The used absorbing liquid passes out under tube 34 and overflows through tube 39 into reservoir 4.

Having described my invention,

I claim:

1. Apparatus for analyzing gas mixtures of the type in which an absorbing liquid is used, comprising a gas pumping device containing a non-absorbing pumping medium, means for pumping the absorbing liquid against said nonabsorbing medium to oscillate the latter, an absorbing and measuring receptacle, and means for conducting absorbing liquid which has been used to oscillate said non-absorbing medium into said absorbing and measuring receptacle. i

2. Apparatus for analyzing gas mixtures of the type in which an absorbing liquid is used, comprising a gas pumping device containing a nonsabsorbiiig pumping medium. means for pumping the absorbing liquid against said non-absorbing pumping medium to oscillate the latter, an absorbing and measuring receptacle, and a conduit terminating at one end in said absorbing and measuring receptacle and at its'other end within said pumping device, said last nientioiicd end being alternately closed by said non-absorbing medium and opened to permit said absorbing liquid to low therethrough into said absorbing and measuring .receptacle.

In testimony whereof the foregoing specifica-.ion is signed.

OLOF RODHE. 

